As one of the most-used, and most-often-replaced, electronic devices in your home, the way you choose, use, and perhaps re-use your computers has environmental implications. Here are seven things to do with a computer to limit that impact:
1. Sleep it. Rather than leave it running continuously through the day, set your computer to go into "sleep" mode when you push the power button, or after it idles for more than 15 minutes or so. With Windows, you do this through the Power Options control panel, on a Mac, through the Energy Saver Preferences. Most laptops now come set to sleep when you close the lid. PCs typically “awake” in three to five seconds.
2. Power it off. The sleep mode cuts power consumption to 5 watts or so, down from around 30 watts for a running laptop, 60 watts for a running desktop and flat-panel monitor. To reduce consumption to almost nothing, use the Operating System menu to shut the computer off entirely at the end of the day or put it into “hibernate” mode. The latter allows slightly faster recovery—30 seconds or so, versus a minute from being powered off—but isn’t ideal if the computer will next be used.
3. Disconnect it. If you want to use less power still, consider using a switched outlet strip to disconnect power to the computer and any other equipment, like a monitor, printer, speakers, scanner, router and backup drive, since these can each draw a few watts of power when idle. Leave your cable modem connected, though, since it can take a while to re-establish your Internet connection if shut off.
4. Upgrade it. Before deciding to replace a computer that's gotten too slow, see if a simple memory increase will give it a new lease on life, for $50 or less. Check how much you have (System Control Panel for Windows, or "About This Mac" for Mac OS) then use a memory configurator on one of the popular shopping sites to see if you can expand it to a gigabyte (1000 MB) or more on your model of PC.
5. Re-use or recycle it. When your computer is no longer needed, try to find someone else that can use it. If not, recycle it responsibly. You'll find advice on re-using and recycling electronics on our sister website, GreenerChoices.org. Recycle that old CRT monitor, too: it contains a lot of toxic lead.
6. Share it. You can save the entire cost of a second computer, and all the energy it would use, by sharing one you have with a family member. To keep your computing lives separate, create a second "user profile" or "account" for each person, on the Users Control Panel in Windows or the Accounts panel in Mac OS. You can quickly switch back and forth between users' desktops without closing anyone's work.
7. "Star" it. Look for the Energy Star designation when buying a new computer. The latest guidelines for the Star require a computer to be extra-efficient in use, when sleeping, and when shut down. —Dean Gallea